The most probable reason you are seeing
Windows Troubleshooting scam ads is because of an adware infection. It is a scam that will possibly attempt to convince you to call Tech support so that scammers could gain remote access to your device and install suspicious, expensive programs. Ad-supported programs can create very invasive advertisements so expect the warnings to constantly interfere with your browsing. You could have encountered the adware contamination when you were installing free software. In case you're worried, the adverts are rather harmless by themselves, and if you do not call the scammers, no harm will be done. However, if you did call them, you could be scammed out of a lot of money, or they would install some type of spying malicious program, and that might allow them access to your private details. Keep in mind that before you authorize anyone to have remote access to your operating system, you should look into them and ensure they are who they say they are. And if you're still concerned about the warning you are getting, it is bogus, and your device is secure. The alerts will only stop popping when you erase Windows Troubleshooting scam, so you ought to do that as soon as possible.
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